Sweep demand system

Claim 1

IN APPARATUS FOR READING INTELLIGENCE-BEARING ITEMS ARRANGED IN LINES OF ITEMS, MEANS FOR SCANNING THE ITEMS IN SCANNING STROKES EACH SPANNING A PLURALITU OF THE ITEMS IN A LINE OF ITEMS, FIRST CONTINUOUSELY DRIVEN MEANS COUPLED TO SAID SCANNING MEANS AND CONTINUOUSLY APPLYING A FIRST DRIVING FORCE THERETO FOR MOVING THE SCANNING MEANS RELATIVE TO THE ITEMS, IN A FIRST DIRECTION THROUGH A READ STROKE ALONG A LINE OF THE ITEMS, SECOND CONTINUOUSLY DRIVEN MEANS NORMALLY DISCONNECTED FROM SAID SCANNING MEANS AND SELECTIVELY CONNECTIBLE THERETO TO APPLY A SECOND DRIVING FORCE THERETO SUPERIOR TO SAID FIRST DRIVING FORCE FOR MOVING SAID SCANNING MEANS THROUGH A RETURN STROKE IN A SECOND DIRECTION OPPOSITE TO SAID FIRST DIRECTION, AND MEANS RESPONSIVE TO ELECTRICAL SIGNALS FOR CONNECTING SAID SECOND DRIVEN MEANS TO SAID SCANNING MEANS TO APPLY SAID SUPERIOR SECOND DRIVING FORCE TO SAID SCANNING MEANS IN OPPOSITION TO SAID FIRST DRIVING FORCE TO OVERPOWER THE LATTER AND INITIATE RETURN MOVEMENT OF SAID SCANNING MEANS IN SAID SECOND DIRECTION AT ANY POSITION DURING MOVEMENT OF SAID SCANNING MEANS IN SAID FIRST DIRECTION.